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Equity method investments - Summary of carrying value and fair value of investments (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value | $ 25,524 | $ 31,134
Kraft Heinz [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value | 8,605 | 13,395
Fair Value | 8,480 | 9,994
Occidental [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value | 16,468 | 17,287
Fair Value | 12,518 | 13,053
Berkadia [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value | $ 451 | $ 452

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